Dust of Darkness

Beyond the depths of the universe, unholy creatures breathed in and out, fire and pain. Recognized and branded by mortal humans as demons of the underworld. Fiends of the fallen angel, Lucifer and primarily known as The Watchers to their prey. Taken from their once mortal human life, and possessed with a demon. A new destiny to exist for centuries with a lifetime tormenting those holy and pure. Lucifer and his fiends sought the most vulnerable of all races, humans. To strip every bit of purity their soul contained and corrupt it from beliefs of right and good, with evil and hate.
All would have been going according to Lucifer's plan, if only for one species; Fairies. A race neither human nor spirit; yet beings who held one key element which kept the demons from spreading darkness across the realm of humankind?fairy dust.